/*
 * WPA Supplicant - Layer2 packet handling example with dummy functions
 * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 *
 * This file can be used as a starting point for layer2 packet implementation.
 */

#include "includes.h"

#include "common.h"
#include "eloop.h"
#include "l2_packet.h"


struct l2_packet_data {
        char ifname[17];
        u8 own_addr[ETH_ALEN];
        void (*rx_callback)(void *ctx, const u8 *src_addr,
                            const u8 *buf, size_t len);
        void *rx_callback_ctx;
        int l2_hdr; /* whether to include layer 2 (Ethernet) header data
                     * buffers */
        int fd;
};


int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
{
        os_memcpy(addr, l2->own_addr, ETH_ALEN);
        return 0;
}


int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
                   const u8 *buf, size_t len)
{
        if (l2 == NULL)
                return -1;

        /*
         * TODO: Send frame (may need different implementation depending on
         * whether l2->l2_hdr is set).
         */

        return 0;
}


static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
{
        struct l2_packet_data *l2 = eloop_ctx;
        u8 buf[2300];
        int res;

        /* TODO: receive frame (e.g., recv() using sock */
        buf[0] = 0;
        res = 0;

        l2->rx_callback(l2->rx_callback_ctx, NULL /* TODO: src addr */,
                        buf, res);
}


struct l2_packet_data * l2_packet_init(
        const char *ifname, const u8 *own_addr, unsigned short protocol,
        void (*rx_callback)(void *ctx, const u8 *src_addr,
                            const u8 *buf, size_t len),
        void *rx_callback_ctx, int l2_hdr)
{
        struct l2_packet_data *l2;

        l2 = os_zalloc(sizeof(struct l2_packet_data));
        if (l2 == NULL)
                return NULL;
        os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
        l2->rx_callback = rx_callback;
        l2->rx_callback_ctx = rx_callback_ctx;
        l2->l2_hdr = l2_hdr;

        /*
         * TODO: open connection for receiving frames
         */
        l2->fd = -1;
        eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);

        return l2;
}


void l2_packet_deinit(struct l2_packet_data *l2)
{
        if (l2 == NULL)
                return;

        if (l2->fd >= 0) {
                eloop_unregister_read_sock(l2->fd);
                /* TODO: close connection */
        }
                
        os_free(l2);
}


int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
{
        /* TODO: get interface IP address */
        return -1;
}


void l2_packet_notify_auth_start(struct l2_packet_data *l2)
{
        /* This function can be left empty */
}
